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SOLAR/1056-78/11 



Monthly 

Performance 

Report 



M. F. SMITH ASSOCIATES 
NOVEMBER 1978 












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U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

M. F. SMITH ASSOCIATES 

NOVEMBER 1978 

I. SYSTEM DESCRIPTION 

M. F. Smith Associates is a single-family residence in Jamestown, Rhode Island. 
The home has approximately 2240 square feet of conditioned space. Solar 
energy is used for space heating the home and preheating domestic hot water 
(DHW). The solar energy system has an array of flat-plate collectors with a 
gross area of 512 square feet. The array faces 15 degrees west of south at an 
angle of 45 degrees to the horizontal. Water is the transfer medium that 
delivers solar energy from the collector array to storage and to the space 
heating and hot water loads. Solar energy is stored in a 3150-gallon concrete 
storage tank. City water is preheated in storage and in heat exchanger HW1 , 
which receives energy from a coil at the output of the heat pump compressor. 
Preheated water is supplied, on demand, to a conventional 82-gallon DHW tank. 
Solar-heated water from the storage tank is directed to a heat pump or to an 
hydronic heat exchanger to provide space heating. When the storage water 
temperature is insufficient to satisfy the heat pump input requirements, an 
electrical heating element (booster unit HR1 ) in the line between storage and 
the heat pump provides auxiliary energy. During the cooling season, heat is 
removed from the conditioned space and discharged into storage, which should 
be maintained below 100°F by operating the collector system at night. An 
electrical heating element in the DHW tank provides auxiliary energy for water 
heating. The system, shown schematically in Figure 1, has three modes of 
solar operation. 

Mode 1 - Collector-to-Storage : This mode activates when the temperature 
difference between the collectors and the bottom of storage is 20°F or higher. 
Pumps PI and P2 circulate water from the storage tank through the collectors 
and back. Circulation continues until the temperature difference between the 
collector and storage falls to 5°F or less. If the temperature in a col- 
lector panel reaches 45°F, the collector array drains down. 

Mode 2 - Storage- to-Space Heating : This mode activates when the manually set 
thermostat in the conditioned space zones 1 and 2 indicates a demand for 
heat. Pump P3 circulates water from storage to the heat pump in the energy 
conservation module (ECM). If the input water temperature is higher than 
90°F, the water will be diverted to an hydronic heating coil. If the water 
temperature is less than 90°F, the water will be diverted to the heat pump. 

Mode 3 - DHW Preheating : This mode activates when city water enters a heat 
exchanger in the storage tank and flows to the HW1 preheater which receives 
energy from a coil at the output of the heat pump compressor inside the ECM. 
When there is no draw, the ECM internal pump circulates hot water from HW2 to 
HW1 , as long as HW1 remains hotter than HW2. If a draw occurs, water flows 
from HW1 to HW2 for a final temperature boost. 




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II. PERFORMANCE EVALUATION 



INTRODUCTION 



The site was unoccupied in November; however, the solar energy system 
operated continuously during the month. Solar energy satisfied 80 percent 
of the space heating requirements. The solar energy system provided electrical 
energy savings of 1.3 million Btu. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
15.1 million Btu for a daily average of 985 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical 
area during November of 1088 Btu per square foot for a plane facing 15 
degrees west of south with a tilt of 45 degrees to the horizontal. The 
average ambient temperature during November was 45°F and was equal to the 
long-term average for November. The number of heating degree-days for the 
month (based on a 65°F reference) was 603, as compared with the long-term 
average of 612. 

THERMAL PERFORMANCE 

Collector - The total incident solar radiation on the collector array for 
the month of November was 15.1 million Btu. During the period the collector 
loop was operating, the total insolation amounted to 12.9 million Btu. The 
total collected solar energy for the month of November was 4.1 million Btu, 
resulting in a collector array efficiency of 27 percent, based on total 
incident insolation. Operating energy required by the collector loop was 
0.12 million Btu. 

Storage - Solar energy delivered to storage was 4.1 million Btu. There 
were 3.1 million Btu delivered from storage to the space heating subsystem. 
Energy loss from storage was 2.4 million Btu and represented 60 percent of 
the energy delivered to storage. The storage efficiency was 40 percent: 
This is calculated as the ratio of the sum of the energy removed from 
storage and the change in stored energy, to the energy delivered to storage. 
The average storage temperature for the month was 90°F. 

DHW Load - There was no DHW load during the month. Operating energy used 
by the DHW recirculation loop pump was 0.030 million Btu. 

Space Heating Load - The space heating subsystem consumed 3.1 million Btu 
of solar energy and 0.76 million Btu of auxiliary electrical energy to 
satisfy a space heating load of 3.9 million Btu. The solar fraction of 
this load was 80 percent. The space heating subsystem consumed a total of 
0.69 million Btu of operating energy, resulting in an electrical energy 
savings of 1.5 million Btu. 



OBSERVATIONS 

During the first half of the month, pump P3 did not indicate power consumption 
when sensor W400 indicated flow; therefore, the power consumption of pump P3 
was estimated during this period. 

On several days during the month the heat pump operated at 15- to 20-minute 
intervals for an entire 24-hour period in order to keep temperatures in heat 
zone 1 within the 69°F to 70°F range and temperatures in heat zone 2 within 
the 63°F to 65°F range. The outside ambient temperatures during these periods 
were usually in the lower 30-degree range. 

ENERGY SAVINGS 

The solar energy system provided a net electrical energy savings of 1.3 mil- 
lion Btu. The DHW subsystem incurred an electrical energy expense of 0.029 
million Btu, while the space heating subsystem contributed an electrical 
energy savings of 1.5 million Btu. 

III. ACTION STATUS 

There are currently no action items. 



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